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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd2c274e9f388f35f6040e3271c744a1256c76c6ff8b18efe77617e5feaa8cb6' 
  AND token = 'sJErIaLOFP0cdKRRULPk2V3jY89tN/ne+36X3kcdceU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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