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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d97eb253fca5df169488da3f8e054fd04ce2a0a20b36d22dfe6e2a059a1df5a' 
  AND token = 'uPOJvSa5HnnlaoK4IWwqfxrQgzU/o7LHGlaGa0HHE8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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