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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cf24ecda0bea352a5655a6f9be74459389e7a2c881367828b67191d26987576' 
  AND token = 't1XkO4zE4FhuKEbIIG3va3RM6cRHCOVTju2bNsqouSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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