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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029ac5fd27451bdf0f9ed7de968c9eb33eb094a5ae45b935e7bd25c0089a5e4d' 
  AND token = 'dTZYOK/gMs03wghfE229J0yRs8M2kO/dFfM5Fb2DDco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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