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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c91d9c7bcae855f7a1b89567d89cf10ba18c70b9ca1c5775b9bb88b6b9f5022' 
  AND token = 'DHj7EzFiATTy+23usGlvyrOifMPgj3D/tYw29rXvNaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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