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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66a45c3f134edc2a00ff51f02455c039ff90cf0c6ea89d88875262600520e2b4' 
  AND token = 'G5gdElkaRwn7JnCi8SuqbPRiuC4Skr9Hboajd/eitxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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