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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b3a079d9ba35aba09a8dc9932bbfc9d6148d53f84eefd3aa154d98ef7d45659' 
  AND token = 'cMuddijZ/rSWLdc7sNJD3B205zFcAN49sNSUESr8f70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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