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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0963296058d09d29803c398bfe01bc51012e74f0f939e7a266c94d039c087617' 
  AND token = 'Bpufrf72kx9MXlkMX+LsYrE+a1C2TcKfyO6xdQlrtbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}