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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a31933a65fea0d637f48b7ea382db003a8d6e586563f904effd60753e36e0a92' 
  AND token = 'SnZQSYacXpQVmSeQJJMDN5M8ka1SQ7iGVcvUlOS8qAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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