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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '179b8f2236d536f1abaf7e9500365a15cb25f6a567c09bdcc019d91fc2e21b01' 
  AND token = '8qEIvud3aJBr6kWyvLu889wEZI/GxUYjpUw/BuDKk5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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