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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aca721764ca154af6f9e7e0f3f0cd298bfe929e1b5effdc3e50661c3714fc800' 
  AND token = '/tHTDoswM7MYMSFX5Oi/PZh1UFNWmpOtD4+PdrIpn0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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