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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29b026f673c0a80e7a15c4d6c5370e938e6ccebbf3e1af0c53209291c28991a7' 
  AND token = '1wCvGuyltTLQCkW/6SPr0j99c1G3PlD/v2kefz7nF1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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