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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '520c53f58a1e0a68ad3d0f555f81a56deb7e40396648740836600dac75b6785b' 
  AND token = 'VlnXR2IrMzms+Uq5YxSzra4mXqK5e725ciFq+ckwW3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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