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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cbc302f757b595e8595ca59c6794df24ad9e1525245f09b5bcdc21b9362117f' 
  AND token = '1q1AU63I01TJ+uyxGXLJq+nTzakE6RTEOdw2kD912u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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