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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ed13e79befd3b9574844db319f148f03c4eb8a6652560f50fc05820561d9690' 
  AND token = 'F9Yt1/2TkRQyCPVMt4+3I39x4cnMkCAOAUDysbOUV3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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