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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '335725d1fac5e6725ae9192c898c1c5ff463060a54ab48f4049740a2674fe0a0' 
  AND token = 'EeicKeTW+1edseysWkmRhJyr3pOAYe64VijnpxYwf9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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