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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9189aabd4be6d4ceca03e37e5dabe3ef6ecb87cfbaffb936e0c81539879af951' 
  AND token = 'n9vq+3ehN3dUhchoVvKAfn1NOkejm6h7+sojexjL58w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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