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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea3aa65770b1a10873d2fb001ae3fdf09ae1c3c1364ed7ad870df7876c1963e0' 
  AND token = 'O66S5YX2SMroBMCs6gTTEy9bs3mvK6Vd9mFNUlrhduM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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