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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eff36d548bacd4ab1d6f08868b1a1086cc34ceb9ee2fb5119c77a2a197782fd3' 
  AND token = '5rb0NP9rBiD5wtNg+Dgaf1afQd3QJqpXGOycBNj5kso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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