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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25aa255de63b917642901141013ed3e7e46fb7ff81ae4a290fe92920e366e187' 
  AND token = '8VkQbjMOFEQabNDuaKQWKZFL2iiTtcqBPxVgbjRC18U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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