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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ecadb8573c398509f9b5dc8ce30d3e5f9dab37a530158be7793444621f9d6df' 
  AND token = '906NTQ6vyCsU06KKwYQkxnOfmi8xZ6fEQV7NHrgsFYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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