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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e31daed46851a6ac6497c20bf63e9d8c69148cfb0a1e744d350c99f72ebef571' 
  AND token = 'chzeq10Nifmn0RG3f4IaReAMkVh7OHVNm0w0Q2Te5gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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