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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '430cb94c8688cc0d0db3259002472ac2068e32897140d31c2e566ef080312055' 
  AND token = 'qqjo6yrYY078mqwDIVmKhwDtbA596drpTAOlNbNEQwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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