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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daf01bcd5e68858d888239ce202fd2d35c51ee035952f478664874b3f8f98ddd' 
  AND token = 'NfgQ2V7ofqMpM9hdiNYhLGw42Kym6iHfM2cvtX+Vqes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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