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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5171ecda6c35e372d9727c78102d58e688125267b4ba4e7539cba047164d5129' 
  AND token = 'TTrq64UYQZJL5C6YNUeGMpCiL2irfaz6oCTghue49WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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