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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f874bfe84e8c23fb27622a06f4938f9d5ea74c87e7c467a7a8d4ef52eb69f97' 
  AND token = 'wLoHlY9EkeNafEfT4ZH1BqM3ViopqY9iltvVAwRuUco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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