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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7b70e0c2b06781463ce5674690e4b56be8105b9619bc4b0ae8ad523d55e7088' 
  AND token = '9RaH8EROfSR9uhhSHNIfBacNIJ6G+tLFdl6I+MTMSf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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