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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f457cf3356a6ea0148e909c6d60df1440c9f32cb3837b2e2c88add4d3fa8d5' 
  AND token = 'dnEgT+/whHArUVR+1io5wZaxHFKmsLZohebL/4SnIfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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