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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8e0684b06a9fec288b11fb40ee8b278f87327781c31972698a83ad0a7fd32a6' 
  AND token = '3GZILy+5lbi91+i/0f8m/vfV6Cs99uhG39E3YD+ArXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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