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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74c8b2fb4ded83f93d9ba4a55cd86831ad2e3e1a428ae93f9b07757267d3cffe' 
  AND token = 'A03i0dqQAVw08gakpzOsqEpCARmjLo27fC93rRM2Q1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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