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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c29c4956404b4d436934d0304d7f29633621bc176ff1a47af8db290c8f21daf' 
  AND token = 'vQuNbsRKakJ40GSSA4U4ZipiSvmRv7DZ9fpFUzVAovw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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