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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bd61c7b1730cf7b0055eb968c3723fa984539c948b790c764cf9863c5ac0545' 
  AND token = '0VEMKIVLkrAshyx/+zy3fNH8Vw+dCyxy+SnuV6FPf/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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