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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eaf020d84dc1001f42fddccaf99575d3c3225ad9e788a644b5c977b1ec85b3b' 
  AND token = 'ypp5u0AoR7uMWetaFTUn8oCNQBgKjp5CXHaqUDLBcWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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