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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b91b7fa41b675a7986eb4ba0f05a585a05b713800ad5c4940396c6df3e6f6105' 
  AND token = 'oQCONeD8ipjmGuOaC3nMO7W7AMyrWkwUzV5GYMvLSQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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