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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd28b93d4ee0fb17106ec5240f81574829f3f2e27d00aa596834d06fe0dc6d42d' 
  AND token = 'tm3HNmym7AaXPvJkg5I0ODdE2z06XNZ8jP4+30mwFUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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