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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc41210295dea4e3d1992e27ac02d98fc3879b3e197b8bfeb4b8234295211eea' 
  AND token = '0J6ly596ajoUc1h3vRjXfg236DUYTWkUT5+ejKyY8oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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