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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39d9d955c1d3d191b15c8b3f1b5e723917f1f6e3f7da4c2f7cfea88f50c0e591' 
  AND token = 'AabgouHY/i6ETHhTwL9bYEPrUwqfKbCq4zVbnmG3wTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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