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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b129dd7fd15dd46a44fab5f837899a5f33fd1bc4c115a02ec30a906b2bc156df' 
  AND token = '+3FZ7/AiNLSxy1ntkrffO53IO10ACj6zO7bG1eztBQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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