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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3532ff6d87a15f457c47e0c4c70fd9f6acb5d6de0dd44fdfd4f3e0d586b2d845' 
  AND token = 'S8LoxmJj4DtwBRNPTgs1M4Lnc/jtv9RaudPWVF549JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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