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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1afbe6b11d396f50c2ad8e3f0f0beb618b38cdb2b1b9e896da60345c7d73c6a' 
  AND token = 'HfrphEOPwf59cbjey5lw9Z40kkoPMewH8e82I9Duwno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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