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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '773dc49b3cb4552b1b549edaa59255fe46b46cad826324d13cec650e816860d0' 
  AND token = 'sAQC+slvVeSzn3+zEhCXSVHla6Ur/mC8aw24oLeu+bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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