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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bf3b3d89f8f8c1c9d7388ee83b58d00ed4624c4ec6cd89ab19a3531273a7c2c' 
  AND token = '1EzfvboaWY2iffVFk3qHQnPC4flCbFH5ospb+50QREE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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