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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056278f2c2f50273515aa87161a31dcdc2a4af20939647987bb71a5362aa0a78' 
  AND token = 'Fkk2dp45zu4YsTk2Ecy71yLjm0+aht1p9+jLmqQZRRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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