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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0f0148c612a299f2d9ce82ee089c6451d0a4d4ea0be0128e9a51121bb5b3ff' 
  AND token = 'I7b7v/sn9EPBygnupS7YHlJ08NSZ20pw0r7ccm+HiCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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