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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf0917bb108a5fd4c7f64df6ff17217342f7ba93bde564e547aafb4d450880c6' 
  AND token = '2OpR3ZTOsOnP22aGHuWQi72lkuGSd02+hlS/Zw1SaoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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