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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '737494bd6663c538b5848c64e128cdc0be2545e91186ef85e241f8f01fa9bad6' 
  AND token = 'gbGXU0HWd1yjJ9mVagM78hsJ65t0yp1bwUE8A+uz7To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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