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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f98014a0090b8c8ab9164cc42cd7c95c369671a630496922b58a0e430b4d3f4e' 
  AND token = 'ig1q8AfFZeVk2x9DKgjLgnxVz91902XRFDpAetayk2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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