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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9b842139b91ab7aff4df7e313e9ae647c33671c1a4829cd0f8cbfff66a115c7' 
  AND token = 'hpWfEc/oj7T3v+io9YeMBhwbTsnOwkZbkC7jl0g+HrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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