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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fb52c3d5a6cfaea79fc9f9051a9c2fae6ee575dc9b438c0b1f6c530134ecabd' 
  AND token = 'WIYYLxup6rtNKKb63lI/Sw3oH4PDPgSdTCalTM6JVk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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