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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10c4c4be295ff6c860cbee34fd5dff7cb8468904ec3608b3aefaa573523bbb2d' 
  AND token = 'qTVbtb0aZod7S4UjrzDKb1leYF0yO/XjbCYASa9kqNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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