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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c76383db45ff2869723a08633563270df36b8ef9e8582af65537032794c95a9d' 
  AND token = 'aTFfQM2OEbeklnhvXux5JIDII64ocEVJ+LpsPLdfi6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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