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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2424f9968b8fdc2f1bf37ef5960cdb79b8c6a9e3acd8c6e09806d281173a840e' 
  AND token = 'dx10Ik4ofArhBHwwn72dlWEVeMdZ1qlUsTr8pc92hkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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