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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c92dbe93d213591025a049ff063be39852178ea855c7b04f68a2274f9e951ffc' 
  AND token = 'BT1IL4c++nMAqWQErkCsSGtuA/MhtG4TGA1nrAXstlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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