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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b59aface3b9a0c59163f9b324494f9f919b8f0b252331dc621c388529dcebb45' 
  AND token = 'd7lgr6bmkb1UycTEKy/8vj2lce7o0Vik5+Nk0ikLNY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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