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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9096d0e6d6cba8b2f2650e1ebe6fac0846c2fa317683b5d0da5de1bf53b3d5aa' 
  AND token = '1mSICgsXBPqEqQh5/SchoA7KvznaN5seyuTYiTtjAuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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