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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89d9f8999e421a0ea171dcab1febd0ca75df0618718c26b47aa7f6c3593d168f' 
  AND token = 'eVdYCDsRsLSAYcTzsE3KMtAuqGBCZ1oNoAgkMNAC5jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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