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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54ebd17c9f0aad521e4a8e0c36415b339a3b02a0977aafd1a7b480c2553f866b' 
  AND token = 'Kauo9TrbZ7YgPikTIgTX4Sp6gwXGVG/JS58fDMc3g/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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