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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a23fcf5550a4a91e7d0e586ca5fbfb9cb2d898db31ef95272fc8eef99722e4a5' 
  AND token = 'RfzJmlfFJSEjMe97YPy+1U6y3C/vumi8VI0iPwkC5PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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